The episode begins with Gumball unveiling his newest invention to Darwin, the Entertainernator, which was designed to cater to the short attention spans of kids. As he demonstrates how it works, Nicole bursts into the room with Richard and Anais. They accuse Gumball and Darwin of taking twenty dollars from Nicole's purse, using Richard's toothbrush, and stealing Anais' Daisy the Donkey doll. Gumball and Darwin deny these claims, but they are punished nonetheless by staying in their room until they confess they did it. The rest of the family go to the museum, leaving the boys behind.
Gumball and Darwin then suspect that one of them is responsible for what happened. It becomes clear that neither of them were responsible, when suddenly Darwin notices that the Entertaininator is gone. They then become suspicious, and go around the house to find a secret passageway. Darwin thinks this idea is stupid, but suddenly discovers a cupboard under the stairs leading to a secret room.
Gumball and Darwin explore the room and eventually find a person in there. The mysterious person screams and runs away, and Gumball and Darwin chase after him. They reach the mall and take condiments from a hot dog stand. Gumball then throws the condiments at the mysterious person and misses multiple times, crashing a car, injuring Tina, and damaging a truck. After which the mysterious person surrenders.
Gumball and Darwin ask him questions and find out that the mysterious person can not remember anything because he is "a nobody." When Gumball and Darwin try to give him another purpose in life, they decide he should be their enemy.
The mysterious person then remembers what happened before all this, and apparently during the flashback in the episode "The Void," he turns out to be Rob trying to get Gumball and Darwin's attention, but was ignored. He secretly leaves The Void with them, and is left disfigured and a nobody in the real world.
Rob accepts his role in life, and Gumball and Darwin happily walk away.
This is the third episode which begins a new arc of continuity between different episodes of the show, the first two were "The Shell" and "The Man".
This is the second time a character undergoes a permanent change in their physical appearance. The first time was in "The Shell."
Several movies are referenced by Darwin's explanations; "It was all a dream" is a reference to Inception, "We've been ghosts this whole time" is a reference to The Sixth Sense, "The world is a computer simulation" is a reference to The Matrix, and "One of us is a figment of the other's imagination" is a reference to Fight Club. Gumball leaning back the chair so it may open an underground tunnel is a reference to Indiana Jones and the Last Crusade.
When the toy helicopter crashed into Gumball's face, the propeller disappeared just when it touched the ground.
When Gumball grabs the phone when he and Darwin start to panic, there are two phones mounted on the wall. Both are gone after the phone Gumball is using gets torn off the wall, though there is a hole where the other phone had been.
When Gumball and Darwin walk out the front door, the mailbox is facing the wrong way.
When Rob leaps over the Watterson's fence, his wireframe foot is invisible
Harold is seen both in his backyard, and seconds later in the line for hot dogs.
[The episode starts with Gumball and Darwin in their bedroom. There is something draped under a veil]
Darwin: What is it?
Gumball: It's my greatest invention! I call it...
[He unveils the thing]
Gumball: [Deep voice] The Entertaininator...
Darwin: The Entertaininator?
Gumball: No no no, you–you have to do the voice.
Darwin: Alright, well I think [Deep voice] The Entertaininator [Back to normal voice] seems to be a bunch of junk taped together.
Gumball: No dude, it's the ultimate boredom annihilator. Tailored to the need of a modern child attention span, which happens to be zero-point-eight seconds. [Darwin is looking around] Darwin?
Darwin: Sorry, what was that? I got distracted by– oh look, a shoe!
Gumball: Dude, just check this out... Video game, comic book, RC helicopter, ping-pong! When I get hungry I... [Tries to eat a sandwich taped to The Entertaininator. After about four seconds, he takes a bite out of it and the helicopter falls on him] You get the idea.
[Their parents and Anais burst into the bedroom, breaking the door on the way. All three of them glare at Gumball and Darwin]
Gumball: Whatever it is we did, we didn't do it!
Nicole: Well someone has definitely taken twenty dollars from my purse!
Gumball: So? Could've been Anais.
Nicole: If it was her I wouldn't have known about it, it had to be someone dumb enough to think I wouldn't notice. And it couldn't be your father because his fingers are too fat.
Richard: And someone's been using my toothbrush! And it can't be your mother or Anais because I've tasted theirs and the flavors don't match!
Anais: Yeah, and someone... [Anais is grossed out by the fact that her father was using her toothbrush and sighs] Someone stole Daisy the Donkey! I can't go to the museum without her! It's two for one!
Gumball: Well, it wasn't me.
Darwin: Me neither.
Nicole: Boys, come with me.
[Gumball and Darwin follow Nicole out of their bedroom]
Nicole: Go to your room! [Gumball and Darwin go back inside the room, next to where the door used to be] You're not coming out of their until one of you owns up!
Nicole: That means no TV,
Gumball and Darwin: Aww!
Nicole: No internet,
Gumball and Darwin: Aww!
Nicole: And you miss out on the trip to the museum!
Gumball and Darwin: [Breathes in as if they are about to say something] Eh…
[Nicole sighs and puts the door back on the hinges and slams it. Then she, Anais, and Richard go off to the car, and drive off to the museum]
Who Stole the Stuff?
Gumball: [Has a suspicious looking face as he looks at Darwin] It was you, wasn't it? You took the money!
Darwin: [Has a suspicious face also] Trying to throw it onto me, huh? That sounds like the action of a guilty person!
Gumball: News flash buddy, this nose can smell a lie... [Points to nose]
Darwin: Well this nose can... [Realizes he doesn't have a nose] Well so can I!
Gumball: [Sniffs all over Darwin]
Darwin: [Sniffs all over Gumball]
Gumball and Darwin: [Both breathe in their noses really hard and bump into each other on the head]
Gumball: Okay, clearly it wasn't either of us so this can only mean one thing.
Darwin: [Mystically] It was all a dream...
Gumball: Uhh... No.
Darwin: [Mystically] We've been ghosts this whole time...
Gumball: Uhh... Dude?
Darwin: [Mystically] The world is a computer simulation and we–
Gumball: Darwin, no! It means [Mystically] someone snuck into our house and took the money...
Darwin: No, I meant [Screams and points to where The Entertaininator was] The Entertaininator is gone!
[They both gasp]
Gumball: This can only mean one thing...
Darwin: [Mystically] One of us is a figment of the other one's imagination...
Gumball: No, dude! It means... that someone is still here.
[Gumball and Darwin scream]
Gumball: We need to call the police!
[Gumball and Darwin come running down the stairs, with the phone]
Darwin: We need to hide! He could be anywhere!
Gumball: Let's go to the bathroom, it's got a lock on the door!
[The duo run around the living room, stretching the phone's cord. Then both come rushing into the bathroom. Gumball hurriedly dials the police]
Donut Sheriff: Elmore Police?
Gumball: Yeah, help! There's someone in my house!
Donut Sheriff: I see... Are you in the house right now?
Donut Sheriff: Then that someone is you! Case solved. You're welcome!
[The Doughnut Sheriff hangs up, and in a nearby crime statistics chart puts crime at an all time low. Gumball dials again]
Donut Sheriff: Elmore Police.
Gumball: Listen, you don't understand si–
Donut Sheriff: Now look kid, I already– [Phone disconnects]
[Gumball anxiously waits on the other line, frightened]
Darwin: What? What!?
Gumball: [Mystically] Someone cut the phone line!
[Gumball and Darwin open the door, and look down the stairs. They both watch as the phone cord seems to move, then stretches towards them with the phone's body]
Darwin: What do we do?
[Gumball gets up with the phone stuck to his face]
Gumball: [Through phone] Alright, here's the plan. [Phone pops out] Open your eyes wide, open your mouth wide, casually wave your hands in the air, and follow me.
[They do as Gumball says, and walk calmly out of their house]
Darwin: Wait. Where are we going?
Gumball: I don't know. There's nowhere else to go. I mean this is our house.
Darwin: [Determined] Then let's take it back!
Hunting the Intruder
[Gumball and Darwin come back inside, all the while punching the air in front of them. They walk to the kitchen]
Gumball: Okay, dude. Grab a weapon.
[Gumball tests a rolling pin and a grater. After discarding these two, he picks a mixer]
Darwin: What if he grabbed it, and turned it against you?
Gumball: Well, what would you suggest?
[Darwin takes a hotdog, and slowly slashes the air in front of Gumball]
Darwin: Hi-ya! Hi-ya!
[For each slash, Gumball takes bites out of the hotdog]
Gumball: Yeah, you're right. That's definitely better. What the what!?
[Gumball sees that that the food (and the shelves) in the fridge have disappeared]
Gumball: When did the refrigerator become so shallow?
[He slides the wall of the fridge, revealing a hidden compartment. Gumball gasps, and uncovers a hidden store of food]
Gumball: W-what? Why would a burglar do something like that? [Mystically] This can only mean one thing–
Darwin: [Mystically] He's been living here for months.
Gumball: No! Oh wait actually– yeah, you're right this time.
[They hear clattering upstairs, and whimper. Gumball boldly emerges from the kitchen, and Darwin hands him his hotdog weapon. He goes upstairs, followed by Darwin breathing nervously]
Gumball: [Shoves hotdog in Darwin's mouth][Quietly] Could you stop breathing down my neck? The situation's tense enough.
Darwin: [Swallows hotdog] Sorry.
[Gumball reaches for the handle of the bathroom. As he does this, Darwin makes a tune until Gumball stares at him. Gumball opens the bathroom, and Darwin continues his tune and ends it with a scream]
Gumball: Dude, there's no one in there.
Darwin: But if there had been, it would have been appropriate.
[The intruder dashes by them. Gumball and Darwin go pale and rotate their heads 360 degrees]
Gumball: [Whispering] You can do the music now.
[Darwin does another tune]
Gumball: Right. We know this guy's been living here for a long time, so…?
Darwin: [Mystically] This can only mean one thing…
Gumball: Yeah? What?
Darwin: [Scratches head] Uh I don't know. I just wanted to contribute.
Gumball: [Sighs] It means, he must–
[Darwin imitates him]
Gumball: –have a secret hideout in the house.
Darwin: –the house.
Gumball: And the best way–
Darwin: And the best way–
Gumball: –to find the secret hideout is by accident.
[Gumball leaves, weirded out by Darwin. Darwin follows him downstairs]
Gumball: You'll find, my friend, that when you're looking for a secret passage you'll often discover it when you least expect it.
[He bumps into a bookshelf. When nothing happens, he bumps the shelf again and again until a vase falls on his head]
Gumball: Or, by taking a much deserved rest on this seemingly normal chair.
[Gumball seats on a chair, and leans on it]
Gumball: Which will turn out to be a lever for an underground tunnel–
[The chair falls down. Gumball walks to a painting]
Gumball: Or what about this painting? A secret (???) hiding–
[He tilts the painting, and it falls on his feet. Gumball tries to catch it, but fails]
Darwin: I don't really see how you can find a secret passage without looking–AAAAAH
[Darwin leans on the staircase, and unknowingly pushes open a hidden door. He falls down another staircase]
Gumball: Just like that.
[Gumball goes down into the dark basement. Darwin's eyes and a third one appear]
Darwin: Oh. Thanks for coming, dude. I would have needed a clean pair of lips if I was here by myself.
[Gumball's eyes appear]
Gumball: No worries, bro.
Darwin: Huh? I think I hit my head a little too hard. It's like I'm seeing double… well mow like one and a half. Wait a minute. Close your right eye.
[An eye disappears]
Darwin: Now, close your left eye}}
[Another eye disappears, leaving Darwin's own pair of eyes and the lone eye remaining]
Darwin: I think he's here!
[Gumball turns on a flashlight. The other eye turns out to be a mirror. Gumball sighs in relief]
Gumball: I guess he's not.
[With his flashlight he scans the room, and sees a fresh meal, the stolen money and toothbrush, and Daisy the Donkey and The Entertaininator]
Gumball: [Gasps] Oh. My. Gosh. Imagine how much value this room would add to the house.
Darwin: Oh sure. For sale two bedroom house, spacious backyard, eating kitchen, and a horrifying dungeon for creepy strangers that hide in.
Gumball: Yeah. Now that you mention it, it is kinda grim. I mean how desperate do you have to be to live in some moist dark hole, sleeping on a mattress made out of disease, eating a bowl of leftovers– [Hand gets burned] Ow! [Gasps] Wait. This food… it's hot.
Darwin: [Mystically] This can only mean one thing…
[The intruder reveals himself in between Gumball and Darwin. All of them scream at each other, and the intruder runs away from their house]
Gumball: Hey! Come back!
[Gumball and Darwin chase after him]
Gumball: That really wasn't much of an explanation!
[The intruder screams again]
Gumball: I think he's more scared of us then we are of him.
Darwin: Let's run less scary!
[The intruder looks back and sees the duo smiling creepily]
Intruder: AH! Get away from me, you creepos! [Climbs a fence]
[Gumball and Darwin follow suit. The intruder gets over the next fence with a rake. Darwin uses a shovel, and is launched backwards when he tries to use the shovel as leverage. Gumball succeeds, breaking the fence in the process. The brothers continue their pursuit. On the way, they encounter Harold on a lawnmower]
Gumball: This is an emergency! I'm commandeering this vehicle.
[They take Harold of the vehicle, and ride it]
Harold: Can you do the path's side on the left there?
[They mow the said part, and ride over the fence through a ramp]
Gumball: Come on. This is taking me ages.
[They hop down, and the lawnmower explodes]
Gumball: He's heading for the mall!
[Gumball and Darwin push through a line of people]
Gumball: Get out of the way!
[He makes it past the line, and sees that Darwin is already there]
Darwin: He's getting away.
Gumball: I've got this. [To intruder] Hey!
[He grabs ketchup from a nearby hotdog stand]
Gumball: "Ketch" this "up"!
[The ketchup hits the windshield of Gary's car. This makes him drive into the store in front, temporarily stalling the intruder. The car explodes]
Gumball: Uh… [Grabs hotdog] To be "frank," you got no "furter" to go!
[He throws the hotdog. Tina slips on it, and falls in the way of the intruder]
Gumball: Eh… [Grabs mustard] You "mustard" mit… there's no escape.
[Gumball throws the condiment. It hits a truck's window, and this causes the truck's trailer to fall in front of the intruder]
Intruder: Okay, okay! I surrender.
Darwin: Hm. Nice trail of destruction.
Gumball: To be honest, I'm more ashamed of the puns.
[The intruder is interrogated on a bench]
Gumball: Alright, dude. Why were you hiding in our house?
Intruder: Because there is no place for me in this world. Because I am nothing. Because I have no reason to exist.
Gumball: Yeah. I meant why were you hiding in our house specifically.
Intruder: Oh. Uh 'cause you're the only people in this town thick enough not to notice. You guys had a whole room you didn't even know about.
Gumball: Oh, you know what else is thick? Your mom's chin!
Intruder: I don't have a mom.
Gumball: Yeah. I meant your mom's skin.
Intruder: I still don't have a mom.
Darwin: Quit saying mom.
Gumball: Yeah. I meant your fun twin.
Intruder: I don't have any siblings either.
Gumball: Darn it! I meant your–
Darwin: Gumball, please just stop. So, what happened?
Intruder: I can't remember. I have nothing left of who I was. I'm… nobody.
Gumball: Well, maybe it isn't that bad. I mean there's a lot of people who like to start over and reinvent themselves.
Intruder: Really? Who would I be?
Darwin: You could be the cool slacker guy who only lives for kicks!
Rocky: [Passes by] Sorry dudes. That's taken.
Gumball: Well, you could be the town clown.
[Banana Joe passes by, eats a cupcake, and laughs]
Darwin: You could be like the feeble hypochondriac.
[Teri passes by. Gumball sighs, and unintentionally blows her away]
Gumball: Uh the vegetarian hippy guy!
[Mr. Small walks by them]
Darwin: The grumpy old neighbor!
[Mr. Robinson passes by them]
Gumball: The rich one!
[Masami appears, then floats away]
Darwin: The school jock!
[Tobias smugly walks by]
Gumball: The store clerk!
[Larry walks by]
Darwin: The mechanic!
[Another Larry walks by, with a tire]
Gumball: The video guy!
[Another Larry walks by in video store wear]
Darwin: The pizza guy!
[Larry walks by with pizza]
Gumball: The burger guy!
[Larry walks by in burger store uniform. Gumball sighs as all the Larrys walk away]
Gumball: Or the guy who walks around with no pants on!
[Darwin covers his legs]
Gumball: Darn it! Sorry man all of the personalities are taken.
Darwin: [Gasps] What about a bad one?
Gumball: Yeah. There's no bad guy here! You could be our mortal enemy!
Darwin: You could be like the worst guy the world has ever made.
[The intruder suddenly has epiphany with Darwin's last words echoing in his mind which fades into Mr. Small's voice. Then the screen goes black]
Intruder: I remember.
[Flashback back in the Void]
Mister Small[flashback]: All the mistakes the world has ever made…
[The intruder remembers himself now: he is Rob. He remembers when Gumball and Darwin fly over him and ignore him and his calls]
Rob[flashback]: Guys! Guys, over here!
Rob: I was one of the world's mistakes.
Darwin[flashback]: It's Molly's treehouse!
Rob: But you only cared about Molly. You saved her, and you left me there to rot. But I clung to life!
[Rob is shown, clinging to the back of Janice as Gumball, Darwin, Molly, and Mr. Small escape the Void. Parts of him disintegrate or degrade]
Rob: And I came back!
Gumball[flashback]: What were we talking about again?
[Mr. Small drives away]
Rob: But at the cost, you left me disfigured and nobody. But now you've given me a part to play in the world.
[The scene goes back to the present, showing a vengeful Rob]
Rob: I will be your worst nightmare. I will destroy everything you care about! I will take away everyone you love! I will be your own nemesis!
Gumball: Huh, cool. Glad we could help.
[The episode ends with Gumball and Darwin walking away contently from Rob (who disappointedly looks after them)]